#7377: Symbolic Ring to Maxima via EclObject
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Reporter: nbruin |
Owner: nbruin
Type: enhancement |
Status: needs_work
Priority: major |
Milestone: sage-feature
Component: symbolics |
Keywords:
Author: Nils Bruin, Jean-Pierre Flori |
Upstream: N/A
Reviewer: Jean-Pierre Flori, François Bissey, Karl-Dieter Crisman |
Merged:
Work_issues: |
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Comment(by jpflori):
Ok I found the reason of the strange "ceil" function appearing.
That's because sr_to_max calls op_max=caar(maxima(expr).ecl()) and
maxima(expr) can simplify the object change its structure, so the
dictionary is wrongly built (we get "ceil" for "+").
Putting op_max=maxima(op).ecl() seems functional.
The issue with (log(9)*x).simplify_log('all') is similar.
Maxima transforms log(9!^x) back to log(9)*x before it is passed to string
function in max_to_string:
{{{
(%i8) logexpand:false$
(%i9) string(log(9^x));
(%o9) "log(9)*x"
(%i10) log(9^x);
(%o10) log(9)*x
(%i11) simp:false$
(%i12) log(9^x);
(%o12) log(9^x)
(%i13) string(log(9^x));
(%o13) "log(9^x)"
}}}
As far as the classic pexpect interface is concerned, a lot of problems
are solved if one changes "back" return result to return result._sage_()
in sage.symbolic.integration.external
It used to be return result.sage() but some routines in the fastcalculus
patch for maxlib return symbolic object which do not have such a method
but one with underscores.
I'll post updated patches when they are in a better shape.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7377#comment:68>
Sage <http://www.sagemath.org>
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